Multi-Functional Nail Biting & Behavior Correction Pen: This versatile nail biting prevention not only helps thumb sucking deterrent but also aids in breaking habits like thumb-sucking and pacifier dependency. A single solution for all ages, it effectively addresses these concerns with ease. Instant Results, Creating Taste Memory: Simply apply a small amount to your fingertips, and the unique bitter taste instantly triggers your taste buds, creating a quick biting = bitter memory response. This helps you naturally break the habits of nail biting and thumb-sucking. Long-Lasting Bitter Taste, Water-Resistant: With an innovative formula, the bitter taste lasts 6-8 hours with just one application, even resisting water. No need for frequent reapplication, saving you time and effortmaking it the perfect choice for effective nail care.(Tip: Rotate the pen cap multiple times (10+) to ensure the product dispenses fully) Compact and Portable, Use Anywhere: The unique pen design is lightweight and portable, making it easy to carry and use anytime, anywhere. Whether at home, in the office, or while traveling, nail care has never been more convenient. and delicate, with no harsh odors, so you can feel confident using it.